[Minor] Add function to parse string to rdns request type

contrib/librdns/rdns.h

@@ -352,6 +352,13 @@ const char *rdns_strerror (enum dns_rcode rcode);
  */
 const char *rdns_strtype (enum rdns_request_type type);
 
+/**
+ * Parse string and return request type
+ * @param str
+ * @return
+ */
+enum rdns_request_type rdns_type_fromstr (const char *str);
+
 /**
  * Increase refcount for a request
  * @param req

contrib/librdns/util.c

@@ -247,6 +247,48 @@ rdns_strtype (enum rdns_request_type type)
 	return dns_types[type];
 }
 
+enum rdns_request_type
+rdns_type_fromstr (const char *str)
+{
+	if (str) {
+		if (strcmp (str, "a") == 0) {
+			return RDNS_REQUEST_A;
+		}
+		else if (strcmp (str, "ns") == 0) {
+			return RDNS_REQUEST_NS;
+		}
+		else if (strcmp (str, "soa") == 0) {
+			return RDNS_REQUEST_SOA;
+		}
+		else if (strcmp (str, "ptr") == 0) {
+			return RDNS_REQUEST_PTR;
+		}
+		else if (strcmp (str, "mx") == 0) {
+			return RDNS_REQUEST_MX;
+		}
+		else if (strcmp (str, "srv") == 0) {
+			return RDNS_REQUEST_SRV;
+		}
+		else if (strcmp (str, "txt") == 0) {
+			return RDNS_REQUEST_TXT;
+		}
+		else if (strcmp (str, "spf") == 0) {
+			return RDNS_REQUEST_SPF;
+		}
+		else if (strcmp (str, "aaaa") == 0) {
+			return RDNS_REQUEST_AAAA;
+		}
+		else if (strcmp (str, "tlsa") == 0) {
+			return RDNS_REQUEST_TLSA;
+		}
+		else if (strcmp (str, "any") == 0) {
+			return RDNS_REQUEST_ANY;
+		}
+	}
+
+	return -1;
+}
+
 uint16_t
 rdns_permutor_generate_id (void)
 {